Cynthiana is a city in Harrison County, Kentucky, United States. The population was 6,402 at the 2010 census. It is the county seat of Harrison County, and is located roughly halfway between Cincinnati and Lexington.
Cynthiana was named after Cynthia and Anna Harrison, daughters of Robert Harrison, who had donated land known as the Public Square, though Harrison County was named after Colonel Benjamin Harrison (not the U.S. President) who was an early settler to the area and the sheriff of Bourbon County, Kentucky.
Two battles in the American Civil War were fought in Cynthiana; the first on July 17, 1862, was part of a raid into Kentucky by Confederate General John Hunt Morgan; the second on June 11 and 12, 1864, resulted in defeat of Confederate forces on Morgan's last raid into the state.